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MosaizerProTutorialRepaintingtheGryphononatexturedcanvas
Hereyoulearnhowtopaintonacanvasinseverallayersofpaint.Wewillshowhowtousedifferentbrushsizestomakeagroundlayer,onwhichthefollowingpaintingstrokesaddmoredetailandcontributetothephotorealism.Finally,wewilldemonstratehowasurfacetextureisapplied.
RepaintingtheGryphononatexturedcanvasAbouttexturesInMosaizerPro,texturesarebitmappicturesofatexturedsurface.Eachpictureisaphotocopyofe.g.burlap,jeansorwood.Texturebitmapscaneasilybefoundontheinternet.Justgoogleandmakeachoice.Thetexturesthatweusearecarefullyselectedfromtheheapofavailabletexturebitmaps.Firstofallatextureneedstobephotorealistic.Second,wewantbitmapsoflargepixelsizestocoverasmuchsurfaceaspossibleinonego.Third,thetexturebitmapshouldseamlesslybeconnectedtoeachothertocreatelargersurfaceswithoutvisibleborders.Thepictureontherightshowsagoodtexture(bottom)andabadtexture(top).Andfinally,wewantgoodqualitybitmapswherethecompressionartifacts(withjpgformats)orenlargement(whenzoomedin)ishardlyvisible.Atexturebitmapisappliedasanadditionallayeroverthepictureandhasacertaintransparency.Atypicalsurfacetexturehasatransparencyofappr.1525%,andisusuallyslightlycolored(butblackandwhiteisfineaswell)toaddtotherealismeffect.RequirementsWeneedasourcepicture,severalbrushmasksandagoodqualitytexturebitmap.SinceMosaizerProhaspreinstalledbrushmasksandtextures,wewillusethese.Alibraryofpicturesisnotrequiredbecausewenowusecoloredbrushstrokes,butit’savailableanywaybecausewithoutapicturelibraryMosaizerProdoesnotwork.ThestepstocreateaGryphononatexturedcanvasStep1:loadthesourcepictureandthebrushmaskThesourcepictureisloadedviaFile|Opensourcepicture(foralreadypreviouslyloadedsources)orbyaddinganewpictureviaFile|Newsourcepicture.Weusethepictureofthe1973album‘Gryphon’ofthegroupGryphon(e.g.viahttp://www.gaudela.net/gryphon/).Thebrushmaskwechooseistheb_WaxyCrayon.LoadthismaskasanalphamaskinthetabMasks.Step2:setthebasicpaintingparametersWhenpaintingwithbrushesitishighlyrecommendedtoplaywiththesettingsbeforefinallyrenderingafirstpicture.Wechangedthefollowingsettingsbeforewecreatedanymosaicpicture(withthesesettingsthetotalnumberofcellswillbe529):Colorbackgroundisactivatedandthecoloriswhite(viatabSpecial)Cellsizeissetto60px(isexplainedlater)
brushmasksareusuallyrotated,soactivatetheMaskrotate(viathetabQuicksettings|Othersettings);keepthestandardsettingsoftherotationangles(30to+30degrees)donotactivatetheMaskresizerandomcellsplacementactivated(RandombuildandRandompatternboxesarechecked),1 selectarandomAmountof8 .IntheboxOverlaymask,selecttheColorizeoptionanditsvalueto8(slightlytransparent)ThenpresstheCreateorPreviewbuttontolookatthefirstrenderingeffect.Whydoweusealargebrushwhenalldetailsarenotreproducedverywell?Ourapproachisnotverystraightforwardcomparedwithotherphotomosaiccreations:wewillbuildthepicturefromlayersofpaintedsourcefiles.Eachtimewehaveanewresult,suchasthepictureontheright,wewillusethisasanewbackgroundonwhichwepaintthenextlayer.Witheachlayerwewilltakeasmallerbrushsize,withgrowingvisibilityofdetails,whilethebackgroundneedstobevisibleasafoundationofcolored‘specks’.Thiswayaverydynamicbrushsizerangeiscreated.Intermezzo:ashortlessononrandompatterns15000 Randompatternshaveagreatadvantage:thecellsthatareplacedonthecanvasseemtobe‘painted’withcertainrealism.Randombrush/strokepatternslook‘handmade’bydefinition.10000 Whenthecellsizeindecreased,morecellsaregeneratedtofillthe2 canvassurface.Thepictureontherightshowstherelationbetweencellsize(Hor.axis)andamountofcells(Vert.axis):large5000 cells(60px)generateabout800cellsonthecanvasarea,whilesmallcells(16px)generatemorethan12,000cellsonthecanvas.Whenonlythecellsizeischanged,thecanvassurfacecoverage0 remainsaboutconstant.0 2550 75 Therefore,tocreatealowercoveragetostillsee(partsof)thebackground,theAmountofrandompointsneedtodecrease.So,witheachnextlayerwenotonlyneedtodecreasethecellsize,butalsodecreasetheAmountofrandompoints.Step3:buildingthenextlayerFirst,youneedtoloadtheresultofthepreviousfullrenderingasthebackgroundpicture.AnewbackgroundpictureisloadedviaFile|Newbackgroundpictureandnavigatetotheresults
1 The value of theAmountslider is not visible in versions before Mosaizer Pro 7.0.33 2 This graph values are indicative and depend also on theAmountvalue and size of the source file
folderoftheMosaizerProapplication(orwhereveryouhavedefaultedtheresultpicture).BydefaultMosaizerProsavestheresultfileinthesubfolderResultsas<sourcepicturename>(Result).jpg.Incaseofdoubt,usetheWindowsexplorertolocalizethisresultpicture.Afterloading,alsocheckthisbackgroundpictureviathetabBackgroundintherighttopcorner.Next,chooseasmallerbrushsize(e.g.44px)anddecreasethecellcoverageviatherandomAmountsliderinthetabSpecial|Randomsettings.Wedecreasedthisvalueto6(totalnumberofpictures841).Thenrenderthepictureagain.Picture:thenextlayerontopofthefirstresult.Step4:built2morelayersRepeatstep3threemoretimes.Incaseyoudon’twanttokeeptheintermediateresults,simplyloadthenewbackgroundbyselectingthesamebackgroundagain.Thenewversionwillthenbeloaded.Incaseyouwanttokeeptheintermediateresults,youhavetomanuallyrenameandreloadthebackgroundpicturesagain.WeusedthefollowingsettingsforcellsizeandAmountofrandomcells:Cellsize=28pxwithAmount=4(totalamountofcells=1225)Cellsize=20pxwithAmount=2(totalamountofcells=1800)Cellsize=16pxwithAmount=1(totalamountofcells=2304)Forconveniencetheabovepictureshowsalltheseriesofallrenderingactionssofar(5layersintotal).Fromtoptobottomeachtimeanewbrushlayersisadded.Toppictureisthefirstrendering.Information:weused5stepstoexplaintheapproach.Inpractice3stepscoulddothejobaswell.Withmorelayers,theresultsfrom2or3layersbackwillprobablynotbevisibleagain.
Step5:applythesurfacetextureThecontrolsforthesurfacetexturesarefoundintwoplaces:inthe3Deffectstabthechoiceandsettingsarefound.InthetabColormatch|Transparencytheslidercanhelptoevaluatethebesttransparencysettingsaswell.Wefocusonthefirstcontrolbox:3Deffect:TextureTexture:thet_BurlapTransparency=80%Makethetextureblackandwhite(b/wboxischecked)Texturesize=1.0xDon’tchangetheothersettings,butsimplyrerenderthelastlayer.Nowwehaveactivatedthesurfacetexture,therenderingenginewilladdanadditionalsteptotherenderingsequencebyaddingthistexturetotheresultingpicture.Theresultisshownatthefrontpageofthistutorial.VaryingthebrushmasksWhenthepictureisnowcompleted,it’stimetolookattheeffectofdifferentbrushes.Weshowtheresultsofthefinallayerrendering(incl.texture)offourdifferentbrushes.
FromLtoR:b_WaxyCrayon,b_Airbrush,b_Acrylic,b_Chalkandb_Chalkwith50%maskresizeTheinfluenceoftheAmountsettingsTheparametertocontrolthecoverageofthepaintistheAmountsliderintheRandomsettingstab.Thissliderdetermineshowmanyrandomcellpointsaregenerated.Seefigurebelow.
FromLtoR:Amount=0,3and5,withcellsize16px
SomeotherpossiblevariationsBrushmaskscanberotatedandresized.Trytoresizethebrush(inallsteps)andseetheeffectofcoverageandcolorimpression.Trytominimizetheamountoflayers.Wehaveusedfivelayers,butthreeisalsopossible.Tostillseethebackgroundofeachlayeryouneedtoexperimentwithcoverage(likeinthepicturebefore)andremembertherandomAmountsettings.VarytheColorizevalue(assetintheOverlaymaskcontrolbox).Wehaveusedavalueof8tocreateaslighttransparencyandtomixthestrokesofeachcellwiththeunderlyingstrokes.Asolidstroke(Colorize=10)willalsoresultagreateffects.DecreasetheColorizevaluefrome.g.from10via8downto6foreachlayer(3layers),whileatthesametimemanagethecoveragewiththerandomAmountvalue.Thiswaywitheachlayertransparencywillincrease(thusincreasinglyshowingthepreviouslayer).Useothertexturesandseetheeffect.Trycoloredtextures.
Figure:differenttextures.FromLtoR:t_Burlap,t_Canvas,t_Gaze,t_Jeansandt_SandstoneMosaizerPro©APPHelmondFebruary2009www.mosaizer.com
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